@react-navigation/native/src/useDocumentTitle.tsx

import * as React from 'react';
import type { NavigationContainerRef } from '@react-navigation/core';
import type { DocumentTitleOptions } from './types';

/**
 * Set the document title for the active screen
 */
export default function useDocumentTitle(
  ref: React.RefObject<NavigationContainerRef>,
  {
    enabled = true,
    formatter = (options, route) => options?.title ?? route?.name,
  }: DocumentTitleOptions = {}
) {
  React.useEffect(() => {
    if (!enabled) {
      return;
    }

    const navigation = ref.current;

    if (navigation) {
      const title = formatter(
        navigation.getCurrentOptions(),
        navigation.getCurrentRoute()
      );

      document.title = title;
    }

    return navigation?.addListener('options', (e) => {
      const title = formatter(e.data.options, navigation?.getCurrentRoute());

      document.title = title;
    });
  });
}